Filter-press.



J. wlLsoN. FILTER PRESS.

(Application med Feb. 9, 1899.)

3 Sheets-Sheet I.

(No Model.)

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FILTER PRESS.

(Application mea Feb. 9, 1999.)

('No Model.)

3 Sheets-Sheet 2.

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No. 629,642. Patented July 25, |899.

Y J. WILSON.

FILTER PRESS.

(Afplication tiled Feb. 9, 1B99.) (Ilo Model.) 3 Sheets-Sheet 3.

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JOHN l/VILSON, OF GLASGOV, SCOTLAND.

FILTER-Pases.,

SPEIFLCATION forming part of Letters Patent No. 629,642, dated July 25,1899. pplication filed February 9, 18919. Serial No. 705,111 (No model.)

,To all whom it may] concern.-

Beit known that I, JOHN WrLsoN, of l Hill street, in the city ofGlasgow, Scotland, have invented certain new and useful Improvements inand Relating to Filter-Presses and Similar Filtering Apparatus; and I dohereby declare the following to be a full, clear, and exact descriptionof the invention, such as Will enable others skilled in the art to whichit appertains to make and use the same.

This invention, which relates to iiltcrpresses and similar filteringapparatus, has for its object the provision of means for periodicallyremoving the deposit formed upon the surface of the iiltering medium andis particularly applicable to filter-presses where the deposit is ofsuch a nature as to prevent iiltration before it has acquired sufficientdepth to be removedin the form of cakes by the ordinary methods.

Figure l is a longitudinal elevation of my improved filter-press,showing the course of the iltercloth, the plates being opened outforthat purpose, and Amechanism for closing up and tightening up theplates and frames, as hereinafter more fully referred to. Fig. 2 is aplan of the bed-plate upon which the iiltcrpress stands, showing thebrushes for brushing the cloth, also a mechanical form of opening out,closing up, and tightening up the plates and frames, being analternative method tothat shown in Fig. l. Fig. 3 is an elevation of oneof the plates, showing the under roller attached thereto, combined witha section of the bed-plate and one of the revolving brushes. Fig. a is across-section of the plate, showing the method of grooving the surfacethereof. Fig. 5 is an end elevation of part of two plates and one frame,showing the form of the lower corners of the plates when a scraper isused in addition to or Without a revolving brush'. Fig. G is anelevation of oneof the frames, showing the upper roller attachedthereto. Fig. 7 is a cross-section of a frame, showing the verticalAbars or grooves. Figs. 8 and 9 are respectively part views, drawn to anenlarged scale,

illustrating the method of mechanically drawing out the plates andframes, showing the position of the links when the plates are open (1/tde Fig. S) and closed, (vide Fig. 9.) Figs. l0 and 11 are elevationand plan, respectively, of a third alternative method to be employed foropening out, closing up, and tightening up the plates andframes. Fig. 12is a part elevation corresponding to Figs. 10 and ll, illustrating howthe end plate of filterpress is withdrawn.

The plates and frames are constructed as shown in Figs. 3 and 6, themain inlet-channel being formed as at a and the channel for water,steam, or air as at b. To the entrance or end of the channel o areattached two T- pipes a' a2, Fig. 1,. To the outer ilange of a' isconnected the inlet valve or cock (not shown on the drawings) for theunfiltered liquid, and to the two branches of a2 are connected,respectively, suitable valves or cocks, (not shown on the drawingsalso,) one of which is used for running olii the contents of the filterprior to opening out and the other for running off thc waste water usedin washing the cloth, rbc.

To the upper edges of the frames and to the lower edges of the plates 1attach small brackets c o c2 c3, respectively, which in turn hold inposition the upper rol-ler d and lower roller d. These brackets may becast along with the plate or frame, respectively, the means ol' holdingthe rollers being adapted suitably thereto.

To the bed-plate g l attach two brackets c c, which accommodate the tworollers ff', Figs. l and 2. These rollers are keptin close contact bymeans of the small screws h 7L'. Additional rollers d2 and cl3, Fig. l,are provided, the former being attached to the legs of the lixc'd headof the filter and the latter to the bed-plate (j.

The l'ilter-clothj is passed over the rollers d d d? d3 and through therollers f j", as shown in Fig. 1, and upon thc wheel]2 being rotated bythe pinion f3 in the direction shown by the arrows in Fig. l the clothis drawn through the press.

To the bed-plate g are fixed a number of small bearings it', whichaccommodate revolving brushes le'. These brushes are actuated in onedirection and contrary to the direction in which the cloth j travels bymeans of the small pulleys Rand the position of the brushes is such thatthey come into sufficient contact IOO with lthe clothj when passing overthe bottom rollers d and when the lates and frames are opened out thenecessary distances, as shown. Power for driving the brushes and turningthe rollers ff is communicated by means of the pulley 7a3, or in placeof this pulley a handle may be utilized where the employment of manuallabor would be necessary or more suitable.

In order to open out the plates and frames equidistantly andexpeditiously, I have them cast, as shown in Figs. l, 3, and 6, withround projections m upon their edges. These projections are connectedtogether by means of the small hoops, links, or rings p, which are ofsuch size or dimension that upon the back platerbeing drawn back eachplate and frame is drawn out in succession such distance as the size ofthe hoops will permit, as illustrated in Figs. 8 and 9. They are also soarranged one below the other that upon the closing together ofthe platesthey do not come in contact and prevent the plates so meeting, as willbe better understood reference being had to Fig. 1.

As the drawing out of the plates and frames is an operation requiring acertain amount of power and it is desirable to minimize the .manualattendance necessary, I adopt either ofthree methods of performing this,one of which is shown in Fig. l, one in plan in Fig. 2, and the other inFigs. lO and l1.

In Fig. 1 I form a cylinder s' in the back frame or gauntree s. Withinthis cylinder Work a piston and piston-rod, and to the end of thepistonrod is attached a ring s2. This ring works within a suitableprojection s3 on the back plate r. Water or air under pressure isadmitted to the cylinder by either of the cocks s, the waste water orair escaping by the cocks S5. The side bars n are provided with strapsat in which a key and cotter t t2 are inserted and which serve to keeptight the plates and frames during the process of filtration after thepiston within the cylinder has pushed the plates, dre., as close as thepower employed will allow.

In Fig. 2 a screw e is provided, which works within the boss n. To thisboss is at tached the spur-wheel r2, which in turn is actuated by thepinion o3 and handle r4. By the aid of the smaller wheel e5, which isrigidly attached to the wheel n2, and the use of a crowbar the plates,the., can be given the extra pressnre'neeessary to keep them tight.

In Figs. 10 and ll the process of drawing the end plate r backward andforward is the same as shown in Fig. l; butin the final tightening up adifferent device is adopted. The piston-rod projects through the backcover at s, and along with the 'cylinder s and gauntree s are cast twostrong arms S7. Into these arms by means of the pins SS is connected thecross-bar s, which accommodates the screw s1". The end of this screwpresses upon the end of the piston-rod at s6 and serves to finallytighten up the plates and frames, as vseen in Fig. 1l. 'In slackeningback the screw S10 as soon as the screw clears the end of piston-rod oneof the pins sa may be removed and the cross-bar s swung around so as toclear the piston-rod. As in some instances it is desirable to scrape offthe deposit on the cloth before the brushes come into play, I providefor that in the manner shown in Fig. 5. The projections c3, whichIattach to the bottom of the plates, are formed in the manner and shapeshown, with a slit c4. Into this slit is inserted a scraper e5, whichmay be formed of any suitable material and may or may not be faced withindiarubber. These Scrapers may be keptin suitable contact with thecloth in a variety of wellknown methods, one only of which is shown.

To facilitate the removal of the deposit from the cloth by the brushes,I provide a series of pipes .21, perforated with small holes and runningbetween each plate, as shown in Figs. l and 2. Water or steam may beforced into these pipes and, according to the position of the perforatedholes, projected onto the most suitable points of the cloths while thebrushes are revolving.

As for the purpose of better cleaning the cloths (it is advisable to uselow pressures) I form the plates as shown in section in Fig. 4. Theprojections which form the grooves are horizontal and formed of suitabledepth and distance from each other. By this means a larger proportion ofthe area of the cloth is free from the metal of the plate, and thewinding of the cloth may be stopped at such points as will insure thecloth resting on different successive points after each cleaning.

In the frames, as shown in Figs. 6 and 7, I form a series of verticalbars or divisions When water, steam, or air is applied at the back ofthe cloths, these bars tend to. assist the loosening of the depositprior to its final removal by the brushes, besides serving to counteractthe eect of the bulges which are necessarily formed in the cloth by thehorizontal ribs on the plates.

I clainrM l. In a filter-press the combination of rollers secured to thetop of the frames and the rollers secured to the bottom'of the plates inorder to carry the filtering-cloth substantially as and for the purposeset forth.

2. In a filter-press the combination of' a hydraulic cylinder in theback frame with a swinging screw for the closing up and with drawal ofthe sectional plates substantially as and for the purpose set forth.

3. In a filter-press, the combination with the filter-plates carryingrollers for the passage of the filtering-cloth, of means for causing thesaid filtering-cloth to pass over the said rollers, and means forcleaning the said cloth, substantially as described.

a. In a filterpress,the combination with the filtering-frames carryingat one end rollers for the passage of the filtering-cloth, and platesprovided at opposite ends with rollers IOO IIO

for the passage of the filtering-cloth; of means l in said swingingblock to engage the end ofv for moving the filtering-cloth, and meansfor l said rearward extension of the piston-rod, for 1d cleaning thesame, substantially as described. securing the piston at the end of itsforward 5. In a fi1'ter-press, the combination with a stroke,substantially as described. v 5 cylinder, and a piston Working in saidcylin- JOHN VILSON.

der, said piston having an extension through the rear of said cylinder;of a swinging block in rear of said cylinder, and a screw CarriedWitnesses:

` EDITH WILSON,

JOSEPH HENRY PEARSON;

